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x in (-oo:+oo)
(1/5)*(125-(50*x)) = 55 // - 55
(1/5)*(125-(50*x))-55 = 0
(1/5)*(125-50*x)-55 = 0
1/5*(125-50*x)-55 = 0
1/5*(125-50*x)-55 = 0
-10*x-30 = 0
-10*x-30 = 0
-10*x-30 = 0 // + 30
-10*x = 30 // : -10
x = 30/(-10)
x = -3
x = -3
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